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(11) | EP 2 453 703 B1 |
(12) | EUROPEAN PATENT SPECIFICATION |
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(54) |
Signalling of resource status information between base stations for load balancing Signalisierung von Ressourcenstatusinformationen zwischen Basisstationen für Lastausgleich Signalisation d'informations de statut des ressources entre des stations de base pour l'équilibrage de charge |
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Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
TECHNICAL FIELD:
BACKGROUND ART:
DISCLOSURE OF INVENTON:
BRIEF DESCRIPTION OF THE DRAWINGS:
Figure 1 schematically illustrates a mobile telecommunication system of a type to which the exemplary embodiment is applicable;
Figure 2 schematically illustrates a base station forming part of the system shown in Figure 1;
Figure 3a schematically illustrates a signalling method for signalling the load balancing measurements between two base stations;
Figure 3b schematically illustrates another signalling method for signalling the load balancing measurements between two base stations; and
Figure 3c schematically illustrates a situation where a signalling failure occurs between two base stations;
Figure 3d schematically illustrates one way in which termination may be signalled between two base stations;
Figure 4 illustrates the way in which load information within a base station can be used to dynamically control Handover and cell selection parameters;
Figure 5 schematically illustrates a simple resource status update procedure;
Figure 6 schematically illustrates a master slave based resource status update procedure;
Figure 7a schematically illustrates a common measurement like resource status update procedure (successful initiation);
Figure 7b schematically illustrates a common measurement like resource status update procedure (unsuccessful initiation);
Figure 7c schematically illustrates a common measurement like resource status update procedure (termination);
Figure 8 schematically illustrates a load information procedure; and
Figure 9 illustrates a mechanism in which load information within an eNB can be utilized to dynamically control Handover and Cell (Re-) Selection parameters.
BEST MODE FOR CARRYING OUT THE INVENTION:
Overview
Base Station
Load Balancing - Signalling Mechanism
Details of Resource Status Request Message
Details of Resource Status Update Message
1) Averaged Physical resource block usage for real time traffic on UL based on the Averaging/ Reporting Time specified by the Master base station 5-1;
2) Averaged Physical resource block usage for non-real traffic on UL based on the Averaging/ Reporting Time specified by the Master base station 5-1;
3) Averaged Physical resource block usage for real time traffic on DL based on the Averaging/ Reporting Time specified by the Master base station 5-1; and
4) Averaged Physical resource block usage for non-real time traffic on DL based on the Averaging/ Reporting Time specified by the Master base station 5-1.
Load Information Procedure
Associated SON Functionality
Modifications and Alternatives
Glossary of 3GPP terms
LTE - Long Term Evolution (of UTRAN)
eNodeB - E-UTRAN Node B
UE - User Equipment - mobile communication device
DL - downlink - link from base to mobile
UL - uplink - link from mobile to base
MME - Mobility Management Entity
UPE - User Plane Entity
HO - Handover
RLC - Radio Link Control
RRC - Radio Resource Control
RRM - Radio Resource Management
SAE - System Architecture Evolution
C-RNTI - Cell-Radio Network Temporary Identifier
SIB - System Information Block
U-plane - User Plane
X2 Interface - Interface between two eNodeB
S1 Interface - Interface between eNodeB and MME
TA - Tracking Area
EPC - Evolved Packet Core
AS - Access Stratum
RNL - Radio Network Layer
TNL - Transport Network Layer
RACH - Random Access Channel
MU MIMO - Multi-User Multi Input Multi Output
DMRS - Demodulation Reference Signal Format
MCS - Modulation and Coding Scheme
Introduction
Measurement Definitions
➢ M1 Physical resource block usage for GBR (real time traffic) on UL
➢ M2 Physical resource block usage for non-real traffic on UL
➢ M3 Physical resource block usage for GBR (real time) traffic on DL
➢ M4 Physical resource block usage for non-real time traffic on DL
Signalling Over X2
4.1. All eNB informs measured load information to other neighbors
4.2. eNB requests load information selectively from neighbor eNBs
Details of Resource Status Request Message
➢ Master eNB1 sends an Resource Status Request to Slave eNB2 requesting it to indicate the physical resource block usage either once, or periodically, or event driven manner.
➢ Reporting Characteristics IE indicates whether reporting shall be once, or periodically, or event driven, in which case the event is specified. If the reporting characteristics IE is not set, then the Resource Status Update SHALL be sent only once by the slave eNB.
➢ Note that a separate message to Stop the Resource Status Update need not be specified. The same request message, with Reporting Characteristics value set to 0, shall be interpreted as a request to stop the Resource Status Update reporting, which shall be processed by the receiver immediately and acknowledged with a similar value of 0 in the corresponding Resource Status Update message
➢ In the Resource Status Request message, the reporting characteristics IE would allow the Master eNB to request either periodic or event triggered reports for multiple events and the possibility of providing the thresholds for these events.
➢ In the Resource Status Request message, the Averaging Time could be included by the Master eNB to specify a measurement interval for producing the information requested by Master eNB. If this value is not specified, the slave eNB shall apply a default value
➢ In the Resource Status Request message, the Reporting Time could be included by the Master eNB to specify a reporting based on its internal RRM algorithm. If this value is not specified, the slave eNB shall apply a default value
➢ In the Resource Status Request message, Master eNB could include the cell Id's of the cells for which it is interested in receiving the resource information. If this value is not specified, the slave eNB shall report the resource status of all the cells.
Details of Resource Status Update Message
➢ Resource Status Update message shall also including Reporting Characteristics IE to indicate the reason for this report.
➢ In Reporting Characteristics IE,-couple of the values could reserved to indicate congestion in the cell either in UL or in DL direction in terms of Physical layer resources or any other type of processing resources. Resource Status Update Report with congestion indication can be autonomously sent by slave eNB to the neighbouring Master eNBs who have requested Resource status update whenever a congestion is detected. Further, slave eNB can autonomously send the Resource Status Update Report when the congestion is resolved.Resource Status Update Report could be autonomously sent by slave eNB to the neighbouring Master eNBs who have requested Resource status update whenever UL interference exceeds a particular thereshold in its own cell. Thus incorporating the existing procedure Load Information in it.
➢ Averaged Physical resource block usage for GBR (real time traffic) on UL based on the Averaging/ Reporting Time specified by Master eNB
➢ Averaged Physical resource block usage for non-real traffic on UL based on the Averaging/ Reporting Time specified by Master eNB
➢ Averaged Physical resource block usage for GBR (real time) traffic on DL based on the Averaging/ Reporting Time specified by Master eNB
➢ Averaged Physical resource block usage for non-real time traffic on DL based on the Averaging/ Reporting Time specified by Master eNB
➢ ....
Relation to Load information Procedure
Associated SON functionality
3. Inter-frequency reselection priorities
4. layer specific offset
Conclusions
References
generating a request for resource status information;
sending the generated request to a neighbouring EUTRAN base station (5-2);
receiving one or more resource status update messages from the neighbouring EUTRAN base station (5-2) in response to the requested resource status information;
performing load balancing operations in dependence upon the received one or more resource status update messages; and
controlling handover of one or more associated mobile communication devices (3) to another cell or base station (5) in dependence upon the one or more received resource status update messages, wherein said EUTRAN base station (5-1) is operable to dynamically control Handover and Cell re-selection parameters in dependence upon the one or more received resource status update messages and to deliver, to a mobile communication device (3), Handover and Cell re-selection parameters updated in accordance with said dynamic control.
means for generating (35) a request for resource status information;
means for sending (25) the generated request to a neighbouring EUTRAN base station (5-2);
means for receiving (25) one or more resource status update messages from the neighbouring EUTRAN base station (5-2) in response to the requested resource status information;
means for performing load balancing operations (32) in dependence upon the received one or more resource status update messages; and
means for controlling handover of one or more associated mobile communication devices (3) to another cell or base station (5) in dependence upon the one or more received resource status update messages wherein said EUTRAN base station (5-1) is operable to dynamically control Handover and Cell re-selection parameters in dependence upon the one or more received resource status update messages and to deliver, to a mobile communication device (3), Handover and Cell re-selection parameters updated in accordance with said dynamic control.
a EUTRAN base station (5-1) comprising: means for generating (35) a request for resource status information; means for sending (25) the generated request to a neighbouring EUTRAN base station (5-2); means for receiving (25) one or more resource status update messages from the neighbouring EUTRAN base station (5-2) in response to the requested resource status information; means for performing load balancing operations (32) in dependence upon the received one or more resource status update messages; and means for controlling handover of one or more associated mobile communication devices (3) to another cell or base station (5) in dependence upon the one or more received resource status update messages; wherein said EUTRAN base station (5-1) is operable to dynamically control Handover and Cell re-selection parameters in dependence upon the one or more received resource status update messages and to deliver, to a mobile communication device (3), Handover and Cell re-selection parameters updated in accordance with said dynamic control; and
a mobile communication device (3) configured for handover from said EUTRAN base station (5-1) in accordance with said load balancing operations performed by said EUTRAN base station (5-1) and said Handover and Cell re-selection parameters updated in accordance with said dynamic control.
Erzeugen einer Anforderung von Ressourcenstatusinformationen;
Senden der erzeugten Anforderung an eine benachbarte EUTRAN-Basisstation (5-2);
Empfangen einer oder mehrerer Ressourcenstatus-Aktualisierungsnachrichten von der benachbarten EUTRAN-Basisstation (5-2) als Antwort auf die angeforderten Ressourcenstatusinformationen;
Durchführen von Lastausgleicharbeitsgängen in Abhängigkeit von der empfangenen einen oder den mehreren Ressourcenstatus-Aktualisierungsnachrichten; und
Steuern der Gesprächsweitergabe bzw. des Handovers von einer oder mehreren verbundenen mobilen Kommunikationsvorrichtungen (3) an eine andere Zelle oder Basisstation (5) in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten, wobei die EUTRAN-Basisstation (5-1) betriebsfähig ist, um Handover- oder Zellenneuauswahlparameter in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten dynamisch zu steuern und Handover- und Zellenneuauswahlparameter gemäß der dynamischen Steuerung an eine mobile Kommunikationsvorrichtung (3) zu liefern.
eine Einrichtung zum Erzeugen (35) einer Anforderung von Ressourcenstatusinformationen;
eine Einrichtung zum Senden (25) der erzeugten Anforderung an eine benachbarte EUTRAN-Basisstation (5-2);
eine Einrichtung zum Empfangen (25) einer oder mehrerer Ressourcenstatus-Aktualisierungsnachrichten von der benachbarten EUTRAN-Basisstation (5-2) als Antwort auf die angeforderten Ressourcenstatusinformationen;
eine Einrichtung zum Durchführen von Lastausgleicharbeitsgängen (32) in Abhängigkeit von der empfangenen einen oder den mehreren Ressourcenstatus-Aktualisierungsnachrichten; und
eine Einrichtung zum Steuern des Handovers von einer oder mehreren verbundenen mobilen Kommunikationsvorrichtungen (3) an eine andere Zelle oder Basisstation (5) in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten, wobei die EUTRAN-Basisstation (5-1) betriebsfähig ist, um Handover- oder Zellenneuauswahlparameter in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten dynamisch zu steuern und Handover- und Zellenneuauswahlparameter, die gemäß der dynamischen Steuerung aktualisiert sind, an eine mobile Kommunikationsvorrichtung (3) zu liefern.
eine EUTRAN-Basisstation (5-1), die aufweist: eine Einrichtung zum Erzeugen (35) einer Anforderung von Ressourcenstatusinformationen; eine Einrichtung zum Senden (25) der erzeugten Anforderung an eine benachbarte EUTRAN-Basisstation (5-2); eine Einrichtung zum Empfangen (25) einer oder mehrerer Ressourcenstatus-Aktualisierungsnachrichten von der benachbarten EUTRAN-Basisstation (5-2) als Antwort auf die angeforderten Ressourcenstatusinformationen; eine Einrichtung zum Durchführen von Lastausgleicharbeitsgängen (32) in Abhängigkeit von der empfangenen einen oder den mehreren Ressourcenstatus-Aktualisierungsnachrichten; und eine Einrichtung zum Steuern des Handovers von einer oder mehreren verbundenen mobilen Kommunikationsvorrichtungen (3) an eine andere Zelle oder Basisstation (5) in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten, wobei die EUTRAN-Basisstation (5-1) betriebsfähig ist, um Handover- oder Zellenneuauswahlparameter in Abhängigkeit von der einen oder den mehreren empfangenen Ressourcenstatus-Aktualisierungsnachrichten dynamisch zu steuern und Handover- und Zellenneuauswahlparameter, die gemäß der dynamischen Steuerung aktualisiert sind, an eine mobile Kommunikationsvorrichtung (3) zu liefern; und
eine mobile Kommunikationsvorrichtung (3), die für den Handover von der EUTRAN-Basisstation (5-1) gemäß den von der EUTRAN-Basisstation (5-1) durchgeführten Lastausgleichsarbeitsgängen und den gemäß der dynamischen Steuerung aktualisierten Handover- und Zellenneuauswahlparametern konfiguriert ist.
la génération d'une demande d'informations d'état de ressources ;
l'envoi de la demande générée à une station de base EUTRAN voisine (5 - 2) ;
la réception d'un ou plusieurs messages de mise à jour d'état de ressources à partir de la station de base EUTRAN voisine (5 - 2) en réponse aux informations d'état de ressources demandées ;
la mise en oeuvre d'opérations d'équilibrage de charge en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus ; et
la commande du transfert intercellulaire d'un ou plusieurs dispositif(s) de communication mobile associés (3) vers une autre cellule ou une autre station de base (5) en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, dans lequel ladite station de base EUTRAN (5 - 1) est exploitable de manière à commander dynamiquement des paramètres de resélection de cellule et de transfert intercellulaire en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, et à délivrer, à un dispositif de communication mobile (3), des paramètres de resélection de cellule et de transfert intercellulaire mis à jour selon ladite commande dynamique.
un moyen pour générer (35) une demande d'informations d'état de ressources ;
un moyen pour envoyer (25) la demande générée à une station de base EUTRAN voisine (5 - 2) ;
un moyen pour recevoir (25) un ou plusieurs message(s) de mise à jour d'état de ressources à partir de la station de base EUTRAN voisine (5 - 2) en réponse aux informations d'état de ressources demandées ;
un moyen pour mettre en oeuvre des opérations d'équilibrage de charge (32) en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus ; et
un moyen pour commander le transfert intercellulaire d'un ou plusieurs dispositif(s) de communication mobile associés (3) vers une autre cellule ou une autre station de base (5) en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, dans lequel ladite station de base EUTRAN (5 - 1) est exploitable de manière à commander dynamiquement des paramètres de resélection de cellule et de transfert intercellulaire en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, et à délivrer, à un dispositif de communication mobile (3), des paramètres de resélection de cellule et de transfert intercellulaire mis à jour selon ladite commande dynamique.
une station de base EUTRAN (5 - 1) comportant : un moyen pour générer (35) une demande d'informations d'état de ressources ; un moyen pour envoyer (25) la demande générée à une station de base EUTRAN voisine (5 - 2) ; un moyen pour recevoir (25) un ou plusieurs message(s) de mise à jour d'état de ressources à partir de la station de base EUTRAN voisine (5 - 2) en réponse aux informations d'état de ressources demandées ; un moyen pour mettre en oeuvre des opérations d'équilibrage de charge (32) en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus ; et un moyen pour commander le transfert intercellulaire d'un ou plusieurs dispositif(s) de communication mobile associés (3) vers une autre cellule ou une autre station de base (5) en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, dans lequel ladite station de base EUTRAN (5 - 1) est exploitable de manière à commander dynamiquement des paramètres de resélection de cellule et de transfert intercellulaire en fonction dudit un ou desdits plusieurs message(s) de mise à jour d'état de ressources reçus, et à délivrer, à un dispositif de communication mobile (3), des paramètres de resélection de cellule et de transfert intercellulaire mis à jour selon ladite commande dynamique ; et
un dispositif de communication mobile (3) configuré de manière à opérer un transfert intercellulaire à partir de ladite station de base EUTRAN (5 - 1) selon lesdites opérations d'équilibrage de charge mises en oeuvre par ladite station de base EUTRAN (5 - 1) et lesdits paramètres de resélection de cellule et de transfert intercellulaire mis à jour selon ladite commande dynamique.